callback hell

callbackhell.js

     const user = new XMLHttpRequest();
     user.open("GET", "/user");
     user.send();
     user.onload = () => {
       
       const getPosts = new XMLHttpRequest();
       getPosts.open("GET", `/posts${user.response.id}`);
       getPosts.send();
       getPosts.onload = () => {
       
       const getMessages = new XMLHttpRequest();
       getMessages.open("GET", `/messages${user.response.id}`);
       getMessages.send();
       getMessages.onload = () => {
         // Stop loading and show the useer data on the screen
       }
     }